package com.lin.gulimall.search.service.Impl;


import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.TypeReference;
import com.lin.common.to.es.SkuEsModel;
import com.lin.common.utils.R;
import com.lin.gulimall.search.config.GulimallElaticSearchConfig;
import com.lin.gulimall.search.constant.EsConstant;
import com.lin.gulimall.search.feign.ProductFeignService;
import com.lin.gulimall.search.service.MallSearchService;
import com.lin.gulimall.search.vo.AttrRespVo;
import com.lin.gulimall.search.vo.BrandVo;
import com.lin.gulimall.search.vo.SearchParam;
import com.lin.gulimall.search.vo.SearchResult;
import com.mysql.cj.util.StringUtils;
import lombok.extern.slf4j.Slf4j;

import org.apache.lucene.search.TotalHits;
import org.apache.lucene.search.join.ScoreMode;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.client.ml.EvaluateDataFrameRequest;
import org.elasticsearch.index.query.*;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.aggregations.Aggregation;
import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.aggregations.Aggregations;
import org.elasticsearch.search.aggregations.bucket.MultiBucketsAggregation;
import org.elasticsearch.search.aggregations.bucket.nested.NestedAggregationBuilder;
import org.elasticsearch.search.aggregations.bucket.nested.ParsedNested;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedLongTerms;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedStringTerms;
import org.elasticsearch.search.aggregations.bucket.terms.Terms;
import org.elasticsearch.search.aggregations.bucket.terms.TermsAggregationBuilder;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.sound.midi.Soundbank;
import javax.swing.text.Highlighter;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

@Slf4j
@Service
public class MallSearchServiceImpl implements MallSearchService {

    @Autowired
    RestHighLevelClient client;

    @Autowired
    ProductFeignService productFeignService;

   /*
    * 方法描述
    * @since: 1.14.1
    * @param: 检索所有参数
    * @return: 返回检索结果，里面包含页面需要的所有信息。
    * @author: lin
    * @date: 2022/1/24
    */
    @Override
    public SearchResult search(SearchParam param) {

        //1、动态构建出查询的DSL语句
        SearchResult result = null;

        //2、准备检索请求                剥离成一个方法
        SearchRequest searchRequest = buildSearchRequest(param);

        try {
            //3、执行检索请求
            SearchResponse response = client.search(searchRequest, GulimallElaticSearchConfig.COMMON_OPTIONS);

            //4、分析响应数据封装成我们需要的格式。  也剥离成一个方法。
            buildSearchResult(response,param);
        } catch (IOException e) {
            e.printStackTrace();
        }

        return result;
    }


    /* * 方法描述 : 构建结果数据
     * @since: 1.14.1
     * @param:
     * @return:
     * @author: lin
     * @date: 2022/1/24*/

    private void buildSearchResult(SearchResponse response,SearchParam param) {

        SearchResult result = new SearchResult();

        //1、返回的所有查询到的商品
        SearchHits hits = response.getHits();

        List<SkuEsModel> esModels =new ArrayList<>();
        if (hits.getHits() !=null && hits.getHits().length >0){
            for (SearchHit hit : hits.getHits()) {
                String sourceAsString = hit.getSourceAsString();
                SkuEsModel esModel = JSON.parseObject(sourceAsString, SkuEsModel.class);
                if (StringUtils.isNullOrEmpty(param.getKeyword())){
                    HighlightField skuTitle = hit.getHighlightFields().get("skuTitle");
                    String string = skuTitle.getFragments()[0].string();
                    esModel.setSkuTitle(string);
                }
                esModels.add(esModel);
            }
        }

        result.setProducts(esModels);



        //2、当前所有商品涉及到的属性信息
        Aggregations aggregations = response.getAggregations();

        List<SearchResult.AttrVo> attrVos = new ArrayList<>();
        //这个类型是根据 对Aggregation ctrl+H 和 debug 变量里 aggregations[] 有说明。
        ParsedNested attr_agg = aggregations.get("attr_agg");

        ParsedLongTerms attr_id_agg = attr_agg.getAggregations().get("attr_id_agg");
        for (Terms.Bucket bucket : attr_id_agg.getBuckets()) {
            SearchResult.AttrVo attrVo = new SearchResult.AttrVo();
            long attrId = bucket.getKeyAsNumber().longValue();

            ParsedStringTerms attr_name_agg = bucket.getAggregations().get("attr_name_agg");
            String attrName = attr_name_agg.getBuckets().get(0).getKeyAsString();

            ParsedStringTerms attr_value_agg = bucket.getAggregations().get("attr_value_agg");
            List<String> attrValue = attr_value_agg.getBuckets().stream().map(item -> {
                String keyAsString = item.getKeyAsString();
                return keyAsString;
            }).collect(Collectors.toList());

            attrVo.setAttrName(attrName);
            attrVo.setAttrValue(attrValue);
            attrVo.setAttrId(attrId);



            attrVos.add(attrVo);
        }

        result.setAttrs(attrVos);
//

//        //3、当前商品涉及到的品牌信息
        ParsedLongTerms brand_agg = aggregations.get("brand_agg");
        List<SearchResult.BrandVo> brandVos = new ArrayList<>();

        //得到aggs 对应 名字的 分组后 对buckets进行遍历
        for (Terms.Bucket bucket : brand_agg.getBuckets()) {
            SearchResult.BrandVo brandVo = new SearchResult.BrandVo();
            long brandId = bucket.getKeyAsNumber().longValue();
            brandVo.setBrandId(brandId);

            Aggregations aggregations1 = bucket.getAggregations();
            ParsedStringTerms brand_img_agg = aggregations1.get("brand_img_agg");
            String keyAsString1 = brand_img_agg.getBuckets().get(0).getKeyAsString();
            brandVo.setBrandImg(keyAsString1);

            ParsedStringTerms brand_name_agg = aggregations1.get("brand_name_agg");
            String keyAsString2 = brand_name_agg.getBuckets().get(0).getKeyAsString();
            brandVo.setBrandName(keyAsString2);

            brandVos.add(brandVo);
        }


//        //4、当前商品涉及到的所有分类信息
        ParsedLongTerms catalog_agg = aggregations.get("catalog_agg");
        List<SearchResult.CatalogVo> catalogVos = new ArrayList<>();
        for (Terms.Bucket bucket : catalog_agg.getBuckets()) {
            SearchResult.CatalogVo catalogVo = new SearchResult.CatalogVo();
            catalogVo.setCatalogId(Long.parseLong(bucket.getKeyAsString()));

            ParsedStringTerms catalog_name_agg = bucket.getAggregations().get("catalog_name_agg");
            String catalog_name = catalog_name_agg.getBuckets().get(0).getKeyAsString();
            catalogVo.setCatalogName(catalog_name);

            catalogVos.add(catalogVo);
        }
        result.setCatalogs(catalogVos);
//        ================以上从聚合信息获取====================
//        //5、分页信息-页码
        result.setPageNum(param.getPageNum());
        //5、分页信息-总记录数
        long total = hits.getTotalHits().value;
        result.setTotal(total);
//        //5、分页信息-总页码-计算 11/2 = 5 .. 1
        int totalPages = (int)total%EsConstant.PRODUCT_PAGESIZE == 0?(int)total/EsConstant.PRODUCT_PAGESIZE:((int)total/EsConstant.PRODUCT_PAGESIZE+1);
        result.setTotalPages(totalPages);

        List<Integer> pageNavs = new ArrayList<>();
        for (int i = 1; i < totalPages; i++) {
            pageNavs.add(i);
        }
        result.setPageNavs(pageNavs);

        //6、构建面包屑导航功能

        if (param.getAttrs() !=null && param.getAttrs().size()>0){

            List<SearchResult.NavVo> navVos = param.getAttrs().stream().map(attr -> {
                //1、分析每个attrs传过来的查询参数值
                SearchResult.NavVo navVo = new SearchResult.NavVo();
                //
                String[] s = attr.split("_");
                navVo.setNavValue(s[1]);
                R r = productFeignService.getAttrInfo(Long.parseLong(s[0]));
                result.getAttrIds().add(Long.parseLong(s[0]));
                if (r.getCode()==0){
                    AttrRespVo data = r.getData("attr", new TypeReference<AttrRespVo>() {
                    });
                    navVo.setNavName(data.getAttrName());
                }else {
                    navVo.setNavName(s[0]);
                }
                //取消了面包屑以后，我们要跳转到哪个地方。将请求地址的url里面的当前置空
                String replace = replaceQueryString(param, attr,"attrs");
                navVo.setLink("http://search.gulimall.com/list.html"+replace);

                return navVo;
            }).collect(Collectors.toList());

            result.setNavs(navVos);

        }

        //品牌，分类
        if (param.getBrandId()!=null && param.getBrandId().size() > 0 ){
            List<SearchResult.NavVo> navs = result.getNavs();
            SearchResult.NavVo navVo = new SearchResult.NavVo();
            navVo.setNavName("品牌");
            //TODO 远程查询所有品牌
            R r = productFeignService.brandsInfo(param.getBrandId());
            if (r.getCode()==0){
                List<BrandVo> brand = r.getData("brand", new TypeReference<List<BrandVo>>() {
                });
                StringBuffer buffer = new StringBuffer();
                String replace = "";
                for (BrandVo brandVo : brand) {
                    buffer.append(brandVo.getBrandName()+";");
                    replace = replaceQueryString(param, brandVo.getBrandId() + "", "brandId");
                }
                navVo.setNavValue(buffer.toString());
                navVo.setLink("http://search.gulimall.com/list.html"+replace);
            }
            navs.add(navVo);
        }

        //TODO 分类 : 不需要导航取消




    }

    private String replaceQueryString(SearchParam param, String value,String key) {
        String encode = null;
        try {
            encode = URLEncoder.encode(value, "UTF-8");
            encode.replace("+","%20"); //浏览器对空格编码和java不一样
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }

        String replace = param.get_queryString().replace("&"+key+"=" + encode, "");
        return replace;
    }


    /*  * 方法描述 : 准备检索请求
     * @since: 1.14.1
     * @return:
     * @author: lin
     * @date: 2022/1/24*/

    private SearchRequest buildSearchRequest(SearchParam param) {

        //构建DSL语句的
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();


        /** 模糊匹配，过滤。。。。*/


        //1、构建 bool 查询
        BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();
        //1.1、must-模糊匹配
        if (!StringUtils.isNullOrEmpty(param.getKeyword())){
            boolQuery.must(QueryBuilders.matchQuery("skuTitle",param.getKeyword()));
        }

        //1.2、bool-filter
        if (param.getCatalog3Id() != null){
            boolQuery.filter(QueryBuilders.termQuery("catelogId",param.getCatalog3Id()));
        }

       //1.2、bool-filter
        if (param.getBrandId()!=null && param.getBrandId().size()>0){
            boolQuery.filter(QueryBuilders.termQuery("brandId",param.getBrandId()));
        }


        //1.2、bool-filter
        if (param.getAttrs() != null && param.getAttrs().size()>0){

            for (String attrStr : param.getAttrs()) {
                BoolQueryBuilder boolQuery1 = QueryBuilders.boolQuery();
                //attrs=1_5寸:8寸&attrs=2_16G:8G
                //attrs=1_5寸
                String[] s = attrStr.split("_");
                String attrId = s[0];
                String[] attrValues = s[1].split(":");
                boolQuery1.must(QueryBuilders.termQuery("attrs.attrId",attrId));
                boolQuery1.must(QueryBuilders.termsQuery("attrs.attrValue",attrValues));

                //每一个必须都得生成一个nested查询
                NestedQueryBuilder nestedQuery = QueryBuilders.nestedQuery("attrs", boolQuery1, ScoreMode.None);
                boolQuery.filter(nestedQuery);
            }

        }

        //1.2、bool-filter
        boolQuery.filter(QueryBuilders.termQuery("hasStock",param.getHasStock()==1));

        //1.2、bool-filter
        if (!StringUtils.isNullOrEmpty(param.getSkuPrice())){

            RangeQueryBuilder rangeQuery = QueryBuilders.rangeQuery("skuPrice");

            String[] s = param.getSkuPrice().split("_");
            if (s.length==2){
                rangeQuery.gte(s[0]);
                rangeQuery.lte(s[1]);
            }else if (s.length==1) {
                if (param.getSkuPrice().startsWith("_")){
                    rangeQuery.lte(s[0]);
                }else {
                    rangeQuery.gte(s[0]);
                }
//                if (param.getSkuPrice().endsWith("_")){
//                    rangeQuery.gte(s[0]);
//                }
            }
            boolQuery.filter(rangeQuery);
        }

        //把以前的所有条件都拿来进行封装
        sourceBuilder.query(boolQuery);


        // 排序、分页、高亮


        //2.1、排序
        if (!StringUtils.isNullOrEmpty(param.getSort())){
            String[] s = param.getSort().split("_");
            SortOrder order = s[1].equalsIgnoreCase("asc")?SortOrder.ASC: SortOrder.DESC;
            sourceBuilder.sort(s[0], order);
        }

        //2.2、分页 pageSize:5
        //pageNum: 1 from:0 size 5
        //pageNum: 2 from:5 size 5
        // from = (pageNum-1) * size
        sourceBuilder.from((param.getPageNum()-1) * EsConstant.PRODUCT_PAGESIZE);
        sourceBuilder.size(EsConstant.PRODUCT_PAGESIZE);

        //2.3、高亮
        if (!StringUtils.isNullOrEmpty(param.getKeyword())){
            HighlightBuilder highlightBuilder = new HighlightBuilder();
            highlightBuilder.field("skuTitle");
            highlightBuilder.preTags("<b style='color:red>");
            highlightBuilder.postTags("</b>");
            sourceBuilder.highlighter(highlightBuilder);
        }


       // 聚合分析
        //品牌聚合
        TermsAggregationBuilder aggregationBuilder = AggregationBuilders.terms("brand_agg").field("brandId").size(10);

        //品牌子聚合
        aggregationBuilder.subAggregation(AggregationBuilders.terms("brand_name_agg").field("brandName").size(1));
        aggregationBuilder.subAggregation(AggregationBuilders.terms("brand_img_agg").field("brandImg").size(1));
        sourceBuilder.aggregation(aggregationBuilder);

        //分类聚合
        TermsAggregationBuilder aggregationBuilder1 = AggregationBuilders.terms("catalog_agg").field("catelogId").size(10);
        //分类子聚合
        aggregationBuilder1.subAggregation(AggregationBuilders.terms("catalog_name_agg").field("catalogName").size(10));
        sourceBuilder.aggregation(aggregationBuilder1);

        //属性聚合
        NestedAggregationBuilder attr_agg = AggregationBuilders.nested("attr_agg", "attrs");

        TermsAggregationBuilder attr_id_agg = AggregationBuilders.terms("attr_id_agg").field("attrs.attrId").size(10);
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_name_agg").field("attrs.attrName").size(10));
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_value_agg").field("attrs.attrValue").size(10));

        attr_agg.subAggregation(attr_id_agg);
        sourceBuilder.aggregation(attr_agg);


        System.out.println("构建的DSL语句"+sourceBuilder);

        SearchRequest request = new SearchRequest(new String[]{EsConstant.PRODUCT_INDEX}, sourceBuilder);

        return request;

    }


}
